Grassy area around pond, specifically on a short-mown path, flying low.
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These are no longer as simple as they once were, as there is now X stackelbergi to consider, and possibly X. dives. The defining features are still being refined, but photos of the side of the thorax (presence of yellow spots?) and the frons are useful for consideration.
My Flickr photos...
Lat/Lng: 51.3054, 0.5132
OS grid ref: TQ752592